Edit History

as others have said, there is something wrong with unzipping using browsers. Doing it natively in the filesystem below:

ssh user@yourserver
cd /var/www/html/yoursite/themes/
ls 
(shows your child theme uploaded as zip) 
unzip child_theme.zip

go back into Back office and select the child theme 

edit:

this breaks the site as well... HTTP ERROR 500

installing child theme with ftp produces the following error

. [PrestaShop\PrestaShop\Core\Domain\Theme\Exception\ThemeConstraintException code 2

as others have said, there is something wrong with unzipping using browsers. Doing it natively in the filesystem below:

ssh user@yourserver
cd /var/www/html/yoursite/themes/
ls 
(shows your child theme uploaded as zip) 
unzip child_theme.zip

go back into Back office and select the child theme 

edit:

this breaks the site as well... HTTP ERROR 500

as others have said, there is something wrong with unzipping using browsers. Doing it natively in the filesystem works.

ssh user@yourserver
cd /var/www/html/yoursite/themes/
ls 
(shows your child theme uploaded as zip) 
unzip child_theme.zip

go back into Back office and select the child theme